Comcast's Internet Service Reportedly Suffers Nationwide Outage

Less than 10 minutes later, Comcast's official support account said the issues were resolved for "almost all customers".

A major internet outage hit Comcast users across a swath of the U.S. Monday.

According to DownDetector, which tracks internet outages, Comcast customers are experiencing connectivity issues in "Mountain View, Denver, Portland, Chicago, Seattle, New York, San Francisco, Houston, Minneapolis, and Boston". The company has not said why the outage is occurring.

"Internet issues should now be resolved for nearly all customers". The disruption was caused by a configuration error.

An Arbor Networks engineer told Wired that the disruption was caused by a misconfigured Autonomous System (AS), which issued incorrect IP address data, causing the Border Gateway Protocol (BGP) to spring a "route leak". "If some of them are mislabeled or point the wrong way, assorted chaos can ensue". The company claims a 56 percent market share in the United States, meaning more than half of the country could be facing outages today. This is a reminder, however, that the internet is not as stable as we'd like.